Fibroferrite Mineral Data

Fibroferrite Mineral Data +

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General Fibroferrite Information

Chemical Formula:

Fe+++(SO4)(OH)·5(H2O)

Composition:

Molecular Weight = 258.99 gm

Iron 21.56 % Fe 30.83 % Fe₂O₃

Hydrogen 4.28 % H 38.26 % H₂O

Sulfur 12.38 % S 30.91 % SO₃

Oxygen 61.78 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺(SO₄)(OH)·5(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1833

Locality:

Tierra Amarilla, Copiapó, Chile. Link to MinDat.org Location Data.

Name Origin:

From the Latin, fibra, meaning "fibre" and ferrum, meaning "iron."

Synonym:

ICSD 100721

PDF 38-481

Stypticite

Fibroferrite Image

Images:

Fibroferrite

Comments: Tan-white, acicular crystals of fibroferrite on matrix.
Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Fibroferrite Crystallography

Axial Ratios:

a:c = 1:0.31633

Cell Dimensions:

a = 24.12, c = 7.63, Z = 18; V = 3,844.24 Den(Calc)= 2.01

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 12.1(1), 2.98(0.8), 6.96(0.6),

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Forms: [ 1 1 0] [ 0 1 1] [ 1 0 0] [ 0 0 1]

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Physical Properties of Fibroferrite

Cleavage:

[001] Perfect

Color:

Green gray, Yellow green, White, Light green, Light yellow.

Density:

1.9

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

2 - Gypsum

Luster:

Silky

Streak:

white

Optical Properties of Fibroferrite

Gladstone-Dale:

CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2741,KPDmeas= 0.29,KC= 0.2819

Optical Data:

Uniaxial (+), w=1.532, e=1.57, bire=0.0380.

Calculated Properties of Fibroferrite

Electron Density:

r_electron=2.06 gm/cc
note: r_Fibroferrite=2.01 gm/cc.

Fermion Index

Fermion Index = 0.0058
Boson Index = 0.9942

Photoelectric:

PE_Fibroferrite= 6.99 barns/electron
U=PE_Fibroferrite x r_electron= 14.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fibroferrite is Not Radioactive

Fibroferrite Classification

Dana Class:

31.9.12.1 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.9)where (A+ B++) (XO4) Zq·x(H2O)

(31.9.12)Dana Group

31.9.12.1 Fibroferrite Fe(SO4)(OH)·5(H2O) R 3 3

Strunz Class:

VI/D.01-60 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.01 - Metahohmannite - Xitieshanite series

VI/D.01-10 Metahohmannite Fe2[O(SO4)2]·4(H2O) P1 1

VI/D.01-20 Butlerite Fe(SO4)(OH)·2(H2O) P 2₁/m 2/m

VI/D.01-30 Parabutlerite Fe(SO4)(OH)·2(H2O) Pmnb 2/m 2/m 2/m

VI/D.01-40 Amarantite Fe(SO4)(OH)·3(H2O) P1 1

VI/D.01-50 Hohmannite Fe2(SO4)2(OH)2·7(H2O) P1 1

VI/D.01-60 Fibroferrite Fe(SO4)(OH)·5(H2O) R 3 3

VI/D.01-70 Xitieshanite Fe(SO4)(OH)·7(H2O) P 2₁/a 2/m

Other Fibroferrite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Fibroferrite Specimen Label here :

Fibroferrite

Fe+++(SO4)(OH)·5(H2O)
Dana No: 31.9.12.1 Strunz No: VI/D.01-60
Locality:

Notes: